1064 Aethusa, provisional designation 1926 PA, is a stony background asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 2 August 1926, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[13] The asteroid was named after the plant Aethusa cynapium (fool's parsley).[2]

1064 Aethusa
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date2 August 1926
MPC designation(1064) Aethusa
Named after
Aethusa cynapium
(fool's parsley)[2]
1926 PA · 1962 HF
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc90.66 yr (33,112 days)
Aphelion2.9930 AU
Perihelion2.0917 AU
2.5424 AU
4.05 yr (1,481 days)
0° 14m 35.16s / day
Physical characteristics
Dimensions17.42±3.60 km[3]
18.56 km (derived)[4]
18.66±0.9 km[5]
19.77±0.36 km[6]
20.007±0.173 km[7]
22.377±0.131 km[8]
25.361±4.376 km[9]
8.621±0.004 h[10][a]
12.916±0.002 h[11]
0.2952 (derived)[4]
10.50[5][6][8][9] · 10.6[1][4] · 10.75±0.20[12] · 10.88[3]

Orbit and classificationEdit

Aethusa is a background asteroid with no associated asteroid family. It orbits the Sun in the central main belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,481 days). Its orbit has an eccentricity of 0.18 and an inclination of 10° with respect to the ecliptic.[1] The observation arc begins at Heidelberg/Simeiz Observatory two nights after the asteroid's official discovery observation.[13]

Physical characteristicsEdit

Aethusa is an assumed stony S-type asteroid, the most common type in the inner part of the central asteroid belt.

Rotation periodEdit

In November 2004, a rotational lightcurve of Aethusa was obtained from photometric observations by French amateur astronomer René Roy at Blauvac Observatory (627). Lightcurve analysis gave a rotation period of 12.916 hours with a brightness variation of 0.12 magnitude (U=2), while in March 2006, astronomer Brian Warner at his Palmer Divide observatory in Colorado, United States, obtained a shorter period of 8.621 hours and an amplitude of 0.18 magnitude (U=2).[10][11][a]

Diameter and albedoEdit

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, the MIPS photometer on the Spitzer Space Telescope, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Aethusa measures between 17.42 and 25.361 kilometers in diameter and its surface has an albedo between 0.160 and 0.3202.[3][5][6][7][8][9]

The Collaborative Asteroid Lightcurve Link derives a high albedo of 0.2952 and a diameter of 18.56 kilometers based on an absolute magnitude of 10.6.[4]


This minor planet was named after the genus "Aethusa" in the carrot family, of which the plant Aethusa cynapium – commonly known as fool's parsley, fool's cicely, or poison parsley – is the only member. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 101).[2]

See alsoEdit


  1. ^ a b Lightcurve plot of 1064 Aethusa, Palmer Divide Observatory, Brian D. Warner (2006)


  1. ^ a b c d "JPL Small-Body Database Browser: 1064 Aethusa (1926 PA)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 30 August 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1064) Aethusa". Dictionary of Minor Planet Names – (1064) Aethusa. Springer Berlin Heidelberg. p. 91. doi:10.1007/978-3-540-29925-7_1065. ISBN 978-3-540-00238-3.
  3. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 30 August 2017.
  4. ^ a b c d e "LCDB Data for (1064) Aethusa". Asteroid Lightcurve Database (LCDB). Retrieved 30 August 2017.
  5. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  6. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
  7. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 30 August 2017.
  8. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  9. ^ a b c d Ryan, E. L.; Mizuno, D. R.; Shenoy, S. S.; Woodward, C. E.; Carey, S. J.; Noriega-Crespo, A.; et al. (June 2015). "The kilometer-sized Main Belt asteroid population revealed by Spitzer". Astronomy and Astrophysics. 578: 12. arXiv:1204.1116. Bibcode:2015A&A...578A..42R. doi:10.1051/0004-6361/201321375. Retrieved 30 August 2017.
  10. ^ a b Warner, Brian D. (December 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006". The Minor Planet Bulletin. 33 (4): 85–88. Bibcode:2006MPBu...33...85W. ISSN 1052-8091. Retrieved 30 August 2017.
  11. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1064) Aethusa". Geneva Observatory. Retrieved 30 August 2017.
  12. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 30 August 2017.
  13. ^ a b "1064 Aethusa (1926 PA)". Minor Planet Center. Retrieved 30 August 2017.

External linksEdit